Codeforces Round #350(Div 2)

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因为当天的下午才看到所以没来得及请假所以这一场没有打。。。于是信息课就打了这场的模拟赛。

A题:

*题目描述:
火星上的一年有n天,问每年最少和最多有多少休息日(周六周天)。
*题解:
模7分类讨论一下。
*代码:

#include <cstdio>#include <cstring>#include <algorithm>#include <cmath>#ifdef WIN32    #define LL "%I64d"#else    #define LL "%lld"#endif#ifdef CT    #define debug(...) printf(__VA_ARGS__)    #define setfile() #else    #define debug(...)    #define filename ""    #define setfile() freopen(filename".in", "r", stdin); freopen(filename".out", "w", stdout);#endif#define R register#define getc() (S == T && (T = (S = B) + fread(B, 1, 1 << 15, stdin), S == T) ? EOF : *S++)#define dmax(_a, _b) ((_a) > (_b) ? (_a) : (_b))#define dmin(_a, _b) ((_a) < (_b) ? (_a) : (_b))#define cmax(_a, _b) (_a < (_b) ? _a = (_b) : 0)#define cmin(_a, _b) (_a > (_b) ? _a = (_b) : 0)char B[1 << 15], *S = B, *T = B;inline int FastIn(){    R char ch; R int cnt = 0; R bool minus = 0;    while (ch = getc(), (ch < '0' || ch > '9') && ch != '-') ;    ch == '-' ? minus = 1 : cnt = ch - '0';    while (ch = getc(), ch >= '0' && ch <= '9') cnt = cnt * 10 + ch - '0';    return minus ? -cnt : cnt;}int main(){//  setfile();    R int n = FastIn();    R int minn = n / 7 * 2, maxx = minn;    R int tmp = n % 7;    if (tmp && tmp <= 2 ) maxx += tmp;    else if (tmp) maxx += 2;    if (tmp >= 5) minn += tmp - 5;    printf("%d %d\n",minn, maxx );    return 0;}

B题:

*题目描述:
有n个机器人,每个机器人有一个特征码,而且每个机器人都可以看见它和排在它左边的机器人的特征码。把所有的机器人看见的特征码按顺序排成一排,求第k个特征码是多少?
*题解:
等差数列随便搞一搞。。。
*代码:

#include <cstdio>#include <cstring>#include <algorithm>#include <cmath>#ifdef WIN32    #define LL "%I64d"#else    #define LL "%lld"#endif#ifdef CT    #define debug(...) printf(__VA_ARGS__)    #define setfile() #else    #define debug(...)    #define filename ""    #define setfile() freopen(filename".in", "r", stdin); freopen(filename".out", "w", stdout);#endif#define R register#define getc() (S == T && (T = (S = B) + fread(B, 1, 1 << 15, stdin), S == T) ? EOF : *S++)#define dmax(_a, _b) ((_a) > (_b) ? (_a) : (_b))#define dmin(_a, _b) ((_a) < (_b) ? (_a) : (_b))#define cmax(_a, _b) (_a < (_b) ? _a = (_b) : 0)#define cmin(_a, _b) (_a > (_b) ? _a = (_b) : 0)char B[1 << 15], *S = B, *T = B;inline int FastIn(){    R char ch; R int cnt = 0; R bool minus = 0;    while (ch = getc(), (ch < '0' || ch > '9') && ch != '-') ;    ch == '-' ? minus = 1 : cnt = ch - '0';    while (ch = getc(), ch >= '0' && ch <= '9') cnt = cnt * 10 + ch - '0';    return minus ? -cnt : cnt;}#define maxn 100010int a[maxn], p[maxn];int main(){//  setfile();    R int n = FastIn(), k = FastIn(), tmp = 0, i;    for (i = 1; i <= n + 1; ++i) p[i] = p[i - 1] + i;    for (i = 1; p[i] < k; ++i);    k -= p[i - 1];    for (R int i = 1; i <= n; ++i)        a[i] = FastIn();    printf("%d\n",a[k] );    return 0;}

C题:

*题目描述:
有n个人和m场电影,每个人只会一种语言,m场电影有配音和字幕,如果某个人看的电影是自己会的语言配音的话,他就会很高兴,如果是自己会的语言的字幕的话,他就会一般高兴,否则就会不高兴。问:应该选择哪场电影能够使得很高兴的人最多,在保证非常高兴最多的同时,输出一般高兴的人最多的。如果有多个答案输出任意一个。
*题解:
STL题。。。sort+lower_bound,不过还要手写unique就是了。
*代码:

#include <cstdio>#include <cstring>#include <algorithm>#include <cmath>#ifdef WIN32    #define LL "%I64d"#else    #define LL "%lld"#endif#ifdef CT    #define debug(...) printf(__VA_ARGS__)    #define setfile() #else    #define debug(...)    #define filename ""    #define setfile() freopen(filename".in", "r", stdin); freopen(filename".out", "w", stdout);#endif#define R register#define getc() (S == T && (T = (S = B) + fread(B, 1, 1 << 15, stdin), S == T) ? EOF : *S++)#define dmax(_a, _b) ((_a) > (_b) ? (_a) : (_b))#define dmin(_a, _b) ((_a) < (_b) ? (_a) : (_b))#define cmax(_a, _b) (_a < (_b) ? _a = (_b) : 0)#define cmin(_a, _b) (_a > (_b) ? _a = (_b) : 0)char B[1 << 15], *S = B, *T = B;inline int FastIn(){    R char ch; R int cnt = 0; R bool minus = 0;    while (ch = getc(), (ch < '0' || ch > '9') && ch != '-') ;    ch == '-' ? minus = 1 : cnt = ch - '0';    while (ch = getc(), ch >= '0' && ch <= '9') cnt = cnt * 10 + ch - '0';    return minus ? -cnt : cnt;}#define maxn 200010int a[maxn], num[maxn];struct Poi{    int b, c, pos, num1, num2;    inline bool operator < (const Poi &that) const {return num1 < that.num1 || (num1 == that.num1 && num2 < that.num2);}}p[maxn];int main(){//  setfile();    R int n = FastIn();    for (R int i = 1; i <= n; ++i)        a[i] = FastIn();    R int m = FastIn();    for (R int i = 1; i <= m; ++i)        p[i].b = FastIn(), p[i].pos = i;    for (R int i = 1; i <= m; ++i)        p[i].c = FastIn();    std::sort(a + 1, a + n + 1);    R int newn = 0;    for (R int i = 1; i <= n; ++i)        if (a[i] == a[i - 1]) ++num[newn];        else a[++newn] = a[i], num[newn] = 1;    for (R int i = 1; i <= m; ++i)    {        R int tmp = std::lower_bound(a + 1, a + newn + 1, p[i].b) - a;        if (a[tmp] == p[i].b) p[i].num1 = num[tmp];        else p[i].num1 = 0;        tmp = std::lower_bound(a + 1, a + newn + 1, p[i].c) - a;        if (a[tmp] == p[i].c) p[i].num2 = num[tmp];        else p[i].num2 = 0;    }    std::sort(p + 1, p + m + 1);    printf("%d\n",p[m].pos );    return 0;}

D题:

*题目描述:
你制作一个曲奇需要n种配料,你还有k个可以变成任意一种配料的神奇的粉末。对于每一种配料i,你配出1份曲奇需要第i种配料ai个,而你有bi个这种配料,问:你最多可以配出多少份曲奇?
*题解:
直接二分答案,然后判断需要多少个神奇粉末,再和k比较。
*代码:

#include <cstdio>#include <cstring>#include <algorithm>#include <cmath>#ifdef WIN32    #define LL "%I64d"#else    #define LL "%lld"#endif#ifdef CT    #define debug(...) printf(__VA_ARGS__)    #define setfile() #else    #define debug(...)    #define filename ""    #define setfile() freopen(filename".in", "r", stdin); freopen(filename".out", "w", stdout);#endif#define R register#define getc() (S == T && (T = (S = B) + fread(B, 1, 1 << 15, stdin), S == T) ? EOF : *S++)#define dmax(_a, _b) ((_a) > (_b) ? (_a) : (_b))#define dmin(_a, _b) ((_a) < (_b) ? (_a) : (_b))#define cmax(_a, _b) (_a < (_b) ? _a = (_b) : 0)#define cmin(_a, _b) (_a > (_b) ? _a = (_b) : 0)char B[1 << 15], *S = B, *T = B;inline int FastIn(){    R char ch; R int cnt = 0; R bool minus = 0;    while (ch = getc(), (ch < '0' || ch > '9') && ch != '-') ;    ch == '-' ? minus = 1 : cnt = ch - '0';    while (ch = getc(), ch >= '0' && ch <= '9') cnt = cnt * 10 + ch - '0';    return minus ? -cnt : cnt;}#define maxn 100010int a[maxn], b[maxn], n, k;inline bool check(R long long x){    R long long tmp = 0;    for (R int i = 1; i <= n; ++i)        if (b[i] < 1ll * x * a[i]) tmp += 1ll * x * a[i] - b[i];    return tmp <= k;}int main(){//  setfile();    n = FastIn(), k = FastIn();    for (R int i = 1; i <= n; ++i)        a[i] = FastIn();    for (R int i = 1; i <= n; ++i)        b[i] = FastIn();    R long long l = 0, r = 2e9 + 233;    while (l < r)    {        R long long mid = l + r >> 1;        if (check(mid)) l = mid + 1;        else r = mid;    }    printf(LL"\n",l - 1 );    return 0;}

E题:

*题目描述:
你需要写一个括号序列编辑器。你有一个长度为n的括号序列,以及m个操作,还有初始时光标的位置。每次的操作有:
1.将光标左移一位
2.将光标右移一位
3.删除光标所在的括号以及和它匹配的括号中间的部分。
*题解:
先用一个栈来匹配左右括号序列,然后再用链表维护整个括号序列。每次删除操作就在链表上进行区间删除。(我真的是数据结构写傻了,第一反应居然是Treap,后来马上发现用链表维护就可以了,最后因为边界写搓了没有在规定的时间内ac,后来调过了总算是a了)
*代码:

#include <cstdio>#include <cstring>#include <algorithm>#include <cmath>#ifdef WIN32    #define LL "%I64d"#else    #define LL "%lld"#endif#ifdef CT    #define debug(...) printf(__VA_ARGS__)    #define setfile() #else    #define debug(...)    #define filename ""    #define setfile() freopen(filename".in", "r", stdin); freopen(filename".out", "w", stdout);#endif#define R register#define getc() (S == T && (T = (S = B) + fread(B, 1, 1 << 15, stdin), S == T) ? EOF : *S++)#define dmax(_a, _b) ((_a) > (_b) ? (_a) : (_b))#define dmin(_a, _b) ((_a) < (_b) ? (_a) : (_b))#define cmax(_a, _b) (_a < (_b) ? _a = (_b) : 0)#define cmin(_a, _b) (_a > (_b) ? _a = (_b) : 0)char B[1 << 15], *S = B, *T = B;inline int FastIn(){    R char ch; R int cnt = 0; R bool minus = 0;    while (ch = getc(), (ch < '0' || ch > '9') && ch != '-') ;    ch == '-' ? minus = 1 : cnt = ch - '0';    while (ch = getc(), ch >= '0' && ch <= '9') cnt = cnt * 10 + ch - '0';    return minus ? -cnt : cnt;}#define maxn 500010bool br[maxn];int last[maxn], next[maxn], stack[maxn], pr[maxn], q, m, n;inline void print_ans(){    for (R int i = next[0]; i <= n; i = next[i]) putchar(br[i] ? '(' : ')');    puts("");}int main(){//  setfile();    n = FastIn(), m = FastIn(), q = FastIn();    for (R int i = 1; i <= n; ++i)    {        R char ch = getc();        while (ch != '(' && ch != ')') ch = getc();        br[i] = ch == '(';        last[i] = i - 1;        next[i] = i + 1;    }    next[0] = 1;    last[n + 1] = n;    R int top = 0;    for (R int i = 1; i <= n; ++i)    {        if (br[i]) stack[++top] = i;        else        {            pr[i] = stack[top--];            pr[pr[i]] = i;        }    }    for (R int i = 1; i <= m; ++i)    {        R char opt = getc();        while (opt < 'A' || opt > 'Z') opt = getc();        if (opt == 'L') q = last[q];        if (opt == 'R') q = next[q];        if (opt == 'D')        {            if (br[q])            {                last[next[pr[q]]] = last[q];                next[last[q]] = next[pr[q]];                q = next[pr[q]];            }            else            {                last[next[q]] = last[pr[q]];                next[last[pr[q]]] = next[q];                q = next[q];            }            if (q > n) q = last[n + 1];        }    }    print_ans();    return 0;}
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